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Individual values (n = 13) for the parameters of the lip (A, B, C) and dense collar (D, E, F) are plotted against foraging intensity: neuropilar volume (A, D), density of synaptic boutons (B, E), total number of synaptic boutons (C, F). The volume of the lip and collar, as well as the total number of boutons per lip, correlate positively with foraging intensity (Spearman rank correlations).
